[U-Boot] [PATCH] Ability to modify distro boot filename

[Martyn Welch]

Add in the ability to modify the distro boot filename. Whilst not
immediately useful in normal usage, it allows an alternative
configuration to be provided when other u-boot functionality is used, such
as bootcount limit, to fallback to an alternative boot configuration. In
this case we can follow the same boot path as for normal boot, just
using an alternatively named configuration file.

For example, by providing the following `altbootcmd` when bootcount is in
use:

altbootcmd=setenv boot_config extlinux-rollback.conf; run distro_bootcmd

Signed-off-by: Martyn Welch <martyn.welch at collabora.co.uk>

---

 include/config_distro_bootcmd.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/config_distro_bootcmd.h b/include/config_distro_bootcmd.h
index 373fee78a9..da30a7d84c 100644
--- a/include/config_distro_bootcmd.h
+++ b/include/config_distro_bootcmd.h
@@ -355,15 +355,16 @@
 	"boot_script_dhcp=boot.scr.uimg\0" \
 	BOOTENV_BOOT_TARGETS \
 	\
+	"boot_config=extlinux.conf\0" \
 	"boot_extlinux="                                                  \
 		"sysboot ${devtype} ${devnum}:${distro_bootpart} any "    \
-			"${scriptaddr} ${prefix}extlinux/extlinux.conf\0" \
+			"${scriptaddr} ${prefix}extlinux/${boot_config}\0"\
 	\
 	"scan_dev_for_extlinux="                                          \
 		"if test -e ${devtype} "                                  \
 				"${devnum}:${distro_bootpart} "           \
-				"${prefix}extlinux/extlinux.conf; then "  \
-			"echo Found ${prefix}extlinux/extlinux.conf; "    \
+				"${prefix}extlinux/${boot_config}; then " \
+			"echo Found ${prefix}extlinux/${boot_config}; "   \
 			"run boot_extlinux; "                             \
 			"echo SCRIPT FAILED: continuing...; "             \
 		"fi\0"                                                    \
-- 
2.19.1